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<div class="section" id="frequent-problems">
<span id="problems"></span><h1>Frequent problems<a class="headerlink" href="#frequent-problems" title="Permalink to this headline">¶</a></h1>
<div class="section" id="figure-layout">
<h2>Figure layout<a class="headerlink" href="#figure-layout" title="Permalink to this headline">¶</a></h2>
<div class="section" id="cutoff-labels">
<h3>Cutoff labels<a class="headerlink" href="#cutoff-labels" title="Permalink to this headline">¶</a></h3>
<p>If the axis ticks are too long, the axis labels might be outside
of the figure. When saving the figure, the labels can be cutoff.</p>
<p>For instance the following code produces a cutoff y-axis label.</p>
<div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span> <span class="cpf">"../../matplotlibcpp.h"</span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf"><Eigen/Dense></span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf"><iostream></span><span class="cp"></span>
<span class="k">namespace</span> <span class="n">plt</span> <span class="o">=</span> <span class="n">matplotlibcpp</span><span class="p">;</span>
<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
<span class="n">Eigen</span><span class="o">::</span><span class="n">VectorXd</span> <span class="n">x</span> <span class="o">=</span> <span class="n">Eigen</span><span class="o">::</span><span class="n">VectorXd</span><span class="o">::</span><span class="n">LinSpaced</span><span class="p">(</span><span class="mi">200</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">6</span><span class="p">);</span>
<span class="n">Eigen</span><span class="o">::</span><span class="n">VectorXd</span> <span class="n">y</span><span class="p">,</span> <span class="n">z</span><span class="p">;</span>
<span class="c1">// y = exp(sin(x)), z = exp(cos(z))</span>
<span class="n">y</span> <span class="o">=</span> <span class="n">x</span><span class="p">.</span><span class="n">array</span><span class="p">().</span><span class="n">sin</span><span class="p">().</span><span class="n">exp</span><span class="p">().</span><span class="n">matrix</span><span class="p">();</span>
<span class="n">z</span> <span class="o">=</span> <span class="n">x</span><span class="p">.</span><span class="n">array</span><span class="p">().</span><span class="n">cos</span><span class="p">().</span><span class="n">exp</span><span class="p">().</span><span class="n">matrix</span><span class="p">();</span>
<span class="n">plt</span><span class="o">::</span><span class="n">figure</span><span class="p">();</span>
<span class="n">plt</span><span class="o">::</span><span class="n">loglog</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">);</span>
<span class="n">plt</span><span class="o">::</span><span class="n">loglog</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">z</span><span class="p">);</span>
<span class="n">plt</span><span class="o">::</span><span class="n">xlabel</span><span class="p">(</span><span class="s">"Time in lecture"</span><span class="p">);</span>
<span class="n">plt</span><span class="o">::</span><span class="n">ylabel</span><span class="p">(</span><span class="s">"Student confusion"</span><span class="p">);</span>
<span class="n">plt</span><span class="o">::</span><span class="n">grid</span><span class="p">();</span>
<span class="n">plt</span><span class="o">::</span><span class="n">savefig</span><span class="p">(</span><span class="s">"loglog.pdf"</span><span class="p">);</span> <span class="c1">// !</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The output is</p>
<img alt="_images/cutoff_labels.pdf" src="_images/cutoff_labels.pdf" />
<p>To fix this problem we can tell MPL to use the available space
on the empty sides of the figure, which can be done
either by a call to <code class="docutils literal notranslate"><span class="pre">tight_layout</span></code> or specifiying <code class="docutils literal notranslate"><span class="pre">bbox_inches="tight"</span></code>
in <code class="docutils literal notranslate"><span class="pre">savefig</span></code>.</p>
<p>Thus the issue is fixed by</p>
<div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="n">plt</span><span class="o">::</span><span class="n">savefig</span><span class="p">(</span><span class="s">"loglog.pdf"</span><span class="p">,</span> <span class="p">{{</span><span class="s">"bbox_inches"</span><span class="p">,</span> <span class="s">"tight"</span><span class="p">}});</span> <span class="c1">// !</span>
</pre></div>
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